Box selecting various strip types
import bpy

# Usage: Place the cursor over the strips you want to be selected and run the script.

# Define current frame and sequence strips

cur_frame = bpy.context.scene.frame_current
strips = bpy.context.scene.sequence_editor.sequences

# Loop over strips and find which overlap with the cursor 

for strip in strips:
    if strip.frame_final_start &lt; cur_frame and strip.frame_final_end &gt; cur_frame:
        strip.select = True
    else:
        strip.select = False


Another (temporary, until the bug is fixed) solution is to paste this script in the Text editor and run it whenever you want to make selection based on the position of the cursor.